If you're brave enough, you could try this: lay one hand on a tabletop and put the other out of sight below. Place a rubber hand on the table where your hidden hand would naturally rest next to its neighbour. And have someone stroke the index finger of your real hidden hand, and the index finger of the rubber hand at the same time.
Frontiers The Moving Rubber Hand Illusion Reveals that Explicit
Science of self - the rubber hand illusion
Is that my hand? How your brain falls for the 'rubber hand illusion
The Rubber Hand Illusion: Top-down attention modulates embodiment
Is There Really a “Rubber Hand” Illusion?
Proprioceptive drift is affected by the intermanual distance
PDF] The Rubber Hand Illusion and Skin-to-Skin Touch: Does the
A Deep Active Inference Model of the Rubber-Hand Illusion
That's My Hand! Activity in Premotor Cortex Reflects Feeling of
Visual appearance of the virtual hand affects embodiment in the
Hypothesis awareness confounds asynchronous control conditions in
Multivariate Analysis of Evoked Responses during the Rubber Hand
Virtual image of a hand displaced in space influences action
Body illusions: Rubber hand illusion